Method of and means for producing concrete surfacing joints



A ril 9, 1935. J. N. HELTZ EL METHOD OF AND MEANS FOR PRODUGING'CONCRETE SURFACING JOINTS l 7 Filed Dec. 1'7, 1928 Y 5 Sheets -Sheet 1 April 9, 1935. .1. N. HELTZ EL 9 mn'mons or'uiin MEANS FOR PRODUCING CONCRETE SURFACING JOINTS Filed Dec. 17, 1928 3 Sheets-Sheet 2 jW MMMMMF w if 5i I Q (1mg- April 1935- O J. N. HELTZEL 1,997,216

METHOD OF AND MEANS FOR PRODUCING CONCRETE SURFACI [NG JOINTS Filed Dec. 17, 1928 3 Sheets-Sheet s Q '1 Pl 7 o 1 8 j 7 g o N m \n T m 'lunmml Fill 1U- Patented Apr. 9, 1935 CONCRETE SURFACING' JOINTS John N; vilelifzel, Warren, Ohio Application peceinberl'i, 1928, Serial N; 326,538

"4 Claims. (01194-39) I 5. producingjoints in a concrete roador other surfacing structure, this application being inpart a continuationof application SerialNo; 3,972, filed January 22, 1925, Patent No, granted January 1,1929.

A further object of the invention vision of novel means for guiding abladeand/or.

strip to enter the plastic concrete,'in order/that the strip or joint memberma be deposited-accurately and conveniently in theTconcreteL -A.further object is the provision ofadditional improvements in embodying the-joint installing means in a machine. i Y I With the foregoing and other object's'in View, which will be apparent as the descriptionIpro-a ceeds, the inventionresides in the construction and arrangement of parts, as hereinafterydescribed and claimed, it being understood that changes canbe made withinthe scope of What is claimed; without departing'from the spirit of the I invention. v

. The invention is illustrated in the accompanying drawings, wherein" Fig". 3'

Figure 1 is a perspective View of, a jointinst'alling device embodying' the improvements, pore tions being broken away.

'Fig. 2"isa cross section of said device illustrating'the first step in the method of producing theio inti 7 Y r 's a similar cross section showing the strip or .she'et being forced down and folded preparatory toentering the concrete,

, Fig. 4 is a similar cross section showing. the

strip forced down into the concrete. I p

5 is a perspective view similar 'to Fig. 1 illustratinga modified form of device, portions p'eingjbroken' away. v v

' gs. 6,"? and 8 are cross sections corresponding to Figs. 2, 3 and 4, showing the steps inthe formation of the joint.

Fig. '9 is a plan viewof a nia'chine embodying longitudinal and transverse joint installing. devlces. l Fig. 10 is a longitudinal vertical section on the line "l0'l0 of Fig.9, onan enlargediscale pore tions being broken away.

Figs. l1 and 12 are'cross sections on thje respec- .tive lines |l| I and IE-"I'Zof Fig. 10,

Fig. '13 is an enlarged cross-section ontheiline 13-43 of Fig. 9 i v Fig. 14 "is a perspective View of a concrete'fspade ing or chopping device for producinga cut' or slot in the plastic concrete to'r'eceiv'eithe joint strip orme mber. v f Fi'g. 15 is a per'sp'ective view of anothe'rflform ofjsp'adin'g or chopping device; j

Fig. 16 is a perspective 'viewlofTanother device f-o'r'producing a cut. or slot in the plastic'concrete and depressing a joint'strip therein.

Referring to Figs. 1, 2, 3"a'r 'di4jwhichj'are' taken from application Serial Nol' 3j 972jhereinbefor re ferred to, ii-mandrel blade 2l is movable downwardly between a pair of p'arallelguide barsior inem he rs 30 when thrust downwardly to enter the plastic concrete... Said bars 30 have depending flanges 3|, the lower edges of whichfare sharp in order to. slightly fenter'the concrete "along 4 the opposite, sides of the line of the joint, thebars' till-being supported by handorbyfmachinqjor other mechanical means. Arches SZaresecufred to the bars 30 and have upstanding "slotted guides 33 in which the mandrelbladefil dispose'dtvhen raised, and the blade 2| has"snitable meansffor depressing and raising itfj' As shown, the bladefZl has. the-upstanding arms 34. In using the" appliance it is p itiorie'd over the desired line, with the edg'esioffthe anges 3| entering the concrete slightlyif'lfhestrip 23 of paper; fabric; sheet metal or. otherjsuitable material is then positioned on the fb'ars130; and may he slid lengthwise on said bars under the blade which is'jin raisedposition. Thejbladeis then moved downwardly, therebyfl forcing! the central portion of thesheeti or strip 2'3'down' into the slotbetween the bars 30', and folding'theflstrlp to "bring the opposite wings or sides thereof against thesides of the blade), .The stripv is thus folded or doubled before entering thelconc'rete, and the blade. moving downwardly willforcefthe strip into the concrete, ,asjseen in Figure 4, after which the bladeis raised to retract it fromj the stripythe blade 2| not being in contact withthe sidewalls of the concrete along the. jointgthe concrete will not tear upor becomedistorted when the blade 2! is withdrawn from h foldedstrip 23 because the, sides of' the bladie are in! contact with .theflinsidefwalls' of. the strip'23;

the blade 2 i, therefore, doesnot contact with the inside wall'of the plastic concrete and there is no friction or distorting action, of the plastic con .cre't'ewhen the blade 2| is withdrawn from, within the strip. By using tliebars'B'O'the strip is folded thereby, and this will reducethe agitationjjofthe concrete at thejoint, I assisted by Ltlie']fiarigesv 31 between which the strip enters the "concrete.

devices and comprises a suitable frame I mounted may also be reversed as shown in Figures 14 and 15 with flanges resting on the concrete or supported slightly abovethe surface of the concrete.

As shown in Figures 5-8 the bars 30 have flanges 3|, and said bars are connected byupstanding slotted guides 33a in which the mandrel blade 2|a is positioned.

As seen in Figure 6, the strip 23 is placed on the bars 30 under the raised blade,2|a, and said blade is then forced downwardly. to fold the strip and force it downwardly between the flanges 3| into the concrete, substantiallythe same as with the device shown in Figures 1 4. The blade 2|a is forced downwardly byineans .of one or more rams 35 which are usedto receive the blows of a hammeror other driving implement, said rams .35 passing downwardly between the bars 30, as seen in Figure 8. l

Thebars 30may then be removed from the concrete leaving the blade or strip 2|a and the doubled strip 23 in the concrete, so that the blade or bar 2|a willform'a' part of the completed joint, or said blade may be removed subsequently when an open'joint 'isjdesired; therefore, it will beunderstood that if a poured joint is desired, the blade 2|a will be permitted to remain within the folded strip '23 only temporarily to support the, strip in an expanded condition while the concrete is being finished. After the concrete hastaken its initial set, the bladeZlaymay be withdrawn from the concrete from between the inside walls of the folded strip provided it is desired topour and sealithe joint with a tar, bituminous or other suitable material. The folded strip forms a-pocket'or receptacle so that if a crack develops below the strip 23, the 'filler material will be confined within the folded strip and will be retained therein. The blade 2| a may be a bar or strip to form a part-of the. completed joint. ormay be a form for holding the groove open, so that the grove may subsequently be filled with tar, bitumen, or other "composition to seal the joint as described. I

" The blade or strip 2H1. can also be forced down between the bars 30 into the, concrete, without using the strip or sheet 23, and said strip 2|a maybe of metal, woodycomposition, or any suitable material, to provide a joint member to remain in the concrete, or to be uscd as a form for subsequent removalto produce a groov'efin the concrete to be filled with sealing material. v Figs. 9, 10, 11, 12 and 13 illustrate a machine embodying longitudinal and transverse joint installing devices. "1 v The longitudinal jointinstalling device comprises the bars 30 having the vertical blades 3|, andthe blades or angle irons are connected by the arches 33b. a

A carriage-or bridge carries the joint installing on the wheels 2 which travel on the side rails or forms 3, .whichdefine 'theside edges of the road. The wheels 2 have outer flanges 4 and have inner sharp flanges 5 which move between the rails 3 and the concrete to bevel or round off the edges of the concrete. The Wheels 2 are mounted on axles 6 on which the frame I is mounted, and the wheels may be adjusted transversely for roads of diiferent widths.

.A bracket 1 is mounted for transverse adjustment on the forward transverse truss 8 of the frame, and has a rearwardly extending bracket 9 through which a vertical screw I0 is screwthreaded, and the lower end of said screw is swivelled in the front arch 33b of the longitudinal joint installing device, and a vertical screw II is similarly swivelled in the rear arch 33b.

The screw is screw-threaded within a sleeve 25 disposed within a slot l2 in a transverse arch l3 which is secured on spaced longitudinal platforms l4 mounted, in the frame I at opposite sides of the longitudinal joint installing device.

frame I.

The bars 30'may be adjusted by means of the screws I0 and H so that the flanges 3| may contact with 'or slightly enter the plastic concrete, or with the flangesspaced above the concrete, and the strips 2|b may be conveniently positioned between the bars 30 and'forced downwardly into the plastic concrete The flanges 3| guide the strip downwardly into the concrete, and each strip may be positioned in front of the last strip which-was deposited in the concrete, so that the strips abut end to end.

The transverse joint installing device is disposed in rear of the frame I and comprises the parallel transverse bars or angle irons 30a having the upstanding flanges 3 la between which a blade 2 is movable, the bars 30abeing connected by arches 33' which are secured to rearwardly extending levers 5 that are fulcrumed, as at IE, to the frame I.

The bars 30a may be supported in contact with or spaced above the concrete. As shown, screws I? are carried by the levers I5 to seat on a transverse platform |8 carried by the frame, to support the levers 5. Said levers may be swung upwardly for lifting the device from the concrete.

The blade 2| is of T-iron, and has the flanges l9 slidable within the arches 33, and screws 20 are threaded through the arches and areswivelled to the blade 2| for conveniently raising and lowering said blade.

The blade 2|, may be used to cut a groove or slot in the plastic concrete, after which the blade may be raised and a joint strip deposited between the flanges 3| a, so that the blade may be operated as a ram to force the strip down into the. concrete.

The blade 2| may intersect the longitudinal joint, or may be interrupted so as not to interfere with. the. longitudinal joint.

In order to vibrate the blade 2| so that it will be more effective when depressed to enter the concrete or to force a strip down, an engine 22 is mounted on the blade between the ends thereof and has an unbalanced flywheel 24 which in vibrating theblade will assist in driving it downwardly as the screws 20 are rotated tomove said blade downwardly.

The machine has means for cutting or slitting the plastic concrete in advance of the longitudinal joint installing device. "-Thus, axrockin'gan'd sliding blade '36 'is' disposediin'the vertiealwplane of the longitudinal joint at the" renter the'carriage; and-has a 'ban'd*- 3 l" embracing an eccentric 38 '"se-- cured ona transverse shaft 39=mounted for rotatiorp in thebracket 'L' Whcreby' the =blade' 36 -is adjustable transversely-with= the bars 30. The blade 38 has a slot 46 receiving a pin ll onwhich a; roller ispreferably disposed towork inthe slot 40; and said pinfll is carrie'd by-a-vertically-adjustable slide-13 adjusted upwardly 'anddown wardly by 'means of a screw' fly-whereby the blade Slirinaybe adjusted vertically at its forward' end to "remove" the blade from" theconcrete or to ae press the blade to different depths into the concrete.

The shaft 39 has. a sprocket wheel 45 thereon connectedby a sprocket chain lli with'a-sprocket wheel 41 feathered on a transverse shaft 48 mounted'on' the truss8; and the-sprocket-wheel-H is adjustabletransversely with the'bracket ;1

Theshaft lll' is connected by a sprocketchain 49 withasprocket wheel 50 secured tooneof the front axles 6, whereby when? the carriage is propelled, the eccent'ric;38 isrotatedto give the joint, so that the strips. 2 lb may be more readily. forced down into the concrete,.or into thegroove or slot.

Asseen in Figure'13, the axle'tli on which; the sprocket wheel 50 is secured isofsquare crosssection between portions of the'fframe' l, and pins .exteri'd'through the'hub of the wheel 12 at right angles and have rollers 52 thereonfco-ntact ing with'the sides of the axle.6,thereby compelling the wheel 2Ito rotate with the. axle; and alsojmounting said wheel forfree sliding movemerit on the axle'fortransverseadjustment. V

The operation of the machine will nodoubt be apparent from the foregoing, but briefly de scribed is as. follows: When themachine is propelled forwardly the blalde"36 cuts the plastic concrete and forces. the reinforcing-steel 53 down to apoint substantially .below .orto the bottom. ofjthe jointstrip and whenthe machine has been moved. forwardly thei lengthof. one of the strips Zlbgthe next stripiisideposite'd between the bars 30 and forceddown into the cut. "This operation is repeated so as to depositrthe strips 2 lb endito endand produce the longitudinal joint, and I have used a cutting disc instead of blade'j36, which operates more satisfactorily; such. a disc l'03 is disclosed in my "Patent No. 1,740,845, filed 'Eebruary 4th, 1925."

As will be. notedin Fig. 11, when thestrip'l lb isforce'd down into'v the plastic concrete; its upper edge portion is still within the slotiof the guide in overlapping relation with the bars 30, thereby maintaining theupper edge of the strip inplace; and when'the machine moved fo-rwardlythe bars=-move- -longitudinally from the strip tobe positioned for thenext'strip. A

At predetermined points of the-road} the transversejoints are; produced.

Theworkmcn may star-idem theplatforms 1 l4 and f lil 'fjor convenien-tly installing the joints and then finishing -thezrconcrete along the edges of the joints.

""The joi-nts-"may be installed above reinforcing febri'cor-rods 5'3 embedded irithe concrete, which ingthe upstanding flanges,- the blade 2 l having been removed-or omitted. This device comprises a=vertica1 slottedguide 541'having its lower end openand formed withofisets -fifrtoseat'on and straddle the flanges'filaithreby positioning-the guide with it'sis1ot inregistration withthe slot between the "flanges 31a. A red or stem 56" is slidable through the upperend of the guide arid has: a" spade" or chopping blade 5T movable inthe guide, 'and'a handle 58 at its upperiend. The blade 51 may be .reciprocated 'vertica'l'ly'so as to cut the groovej or slot in: the concrete, arid the guide-54 may be 'slidialong the flanges 3 l "This device xmay therefore be conveniently used for spaflding :orchop'pingthe concrete along :a'"pre determined .line' so as'to receive the joint; strip or memb 7 o f Fig; 15 illustrates a" modified forrnv of, spading device for usefwitha'single bar 30a having the upstandingnange 3 la' which serves as a straight ed e u d Th devi .co prisesanu standin guide 5 1a .having slotted portions "55ato fit astride thei'fiange 3 la" for positioning thei'device andpermitting it to. move along saidjflange. A vertical rod 56a is slidable in the guide 54a and hastheblade 51 at its lower endand the handle 58 at its upperend' The rodBS may'be're'ciprO- cate'd" to force the blade 51' into the plastic concretefor cutting. aggroove or slot in which the oin st ip o m mb may be d p it d. a ne r tfimfi d t ht*1 n .9, l" ,jIf desired,thelguideibar or member may be curved'or ofanyothersuitable shape orarra'ngef ment for cutting any desired groove r" 51w for receiving a joint stripof similarshape andarrangement. joints. to. be produced .as l ngitudinal joints. .Fig. .16 illustrates the well as transverse and l fse r a disk'ilbiasa blade to roll between the guide blades 3 lb, and said diskihas the axle'34b secured to. the'forked This enables oblique and other barBBb'havingItheharidleS 58b.for 'pushingjor I pulling' the disk along the slotted guide. "Collars b are provided; on the axle at" thesides of the diskv5'lb to roll .on'theblades 3 lband' regu late thedepth to which the disk' enters theplastic concrete," The disk'in being moved .along the slot willcut a groove in the plastic concrete, and

the disk mayalsolbe usedffor depressing a joint strip into the groove. Thus; after the groove. has been formedandjthe joint strip is placed-between the blades 3 l b, g the disk 51b may. be. rolled .onthje strip to depress it,1.and in this use. of the device collars or gagesfitib of larger diameter may be used so' that the lower e'dge'otthedisk cannot move below or substantially below 'thesurfaceof the concrete when it is desired to deposit the strip substantially'fiush with said" surface.

JI-Iaving thus described the invention, what is claime'das new.is; I f i 1. The methodof producing a"joint"in*a"co'ncrete surfacing structure consisting in'positioning theline of1the"--joint,forcinga joint strip into the'plastic' concrete whileguide'd-by said member,

and removing the guide'member from said strip.

2. The method of producing a joint-in a concrete surfacing structure consisting in positioning a slotted guide over the plastic concrete along the line of the joint, forcing a joint strip from within the slot of said guide into the plastic con crete, and removing the guide from said strip.

3. The method of producing a joint in a concrete surfacing structure consisting in positioning a slotted guide over the 'plastic concrete along the line of the joint, forcing joint material through the slot of the guide into the plastic concrete, and removing said guide from said joint material.

4. The method of producing a joint in a concrete surfacing structure consisting in positioning a guide member over the plastic concrete along the line of the joint, cutting the plastic concrete along the line of said member, forcing a joint strip into the cut made while guided by said member, and removing said guide member from the joint strip. 1 Y

5. The method of producing a joint in a concrete surfacing structure consisting in positioning a slotted guide over the plastic concrete along the line of the joint, cutting the plastic con-. crete through the slot of the guide, forcing joint material through said slot of the guide into the cut made in the plasticconcrete, and removing said guide from the joint material. 7 6. The method of producing ajoint in a concrete surfacing structure consisting in positioning a slotted guide over the plastic concrete along the line of the joint, cutting the plastic concrete through the slot of said guide, forcing ajoint strip from within the slot of the guide into the cut made in the concrete, and removing said guide from said. joint strip.

7. The method of producing a joint in a concrete surfacing structure consisting in positioning a slotted guide over the plastic concrete along the line of the joint,[placing a strip of flexible material on said guide over the slot thereof, and movinga blade downwardly into and through said slot to double said strip on the blade and force it down through said slot into the plastic concrete. v

8. Means for producing a joint in a concrete surfacing structure comprising a guide to bepositioned overthe plastic. concrete and having a slot for guiding a joint strip downwardly into the concrete, and means movable downwardly into, said slot from above the slotto force. said strip downwardly into the concrete.

9. An apparatus for producinga joint in a concrete surfacing structure comprising a guide having a slot, and means adapted to enter said slot from above the slot for forcing'a joint 'strip from within said slot into the plastic concrete.

10. An apparatus for producing a joint in a concrete surfacing structure comprising a slotted guide to be positioned over the plastic concrete, and a blade movable into said guide from above the guide and adapted to force -a joint strip from within the guide into the plastic concrete.

11. An apparatus for producing a joint in a concrete surfacing structure comprising a carriagemovable over. a plastic concrete, 2. guide carried by said carriage to be positioned over the plastic concrete along the line of the joint and having a slot for guiding a joint'strip down into the concrete, and means movable into said slot from above the slot for forcingthe joint strip down into the concrete.

12. An apparatus for producing a joint in a concrete surfacingstructure comprising a carriage movable over theplastic concrete, a guide carried by the carriage having an upwardly-opening slot to be disposed along the line of the, joint and to receive joint material to enter the plastic concrete, and means movable downwardly into said slot from above the slot for forcing the joint material down from within the slot into the plastic concrete.

13. An apparatus for producing a joint in a concrete surfacing structure comprising a carriage; movable over plastic concrete, a slotted guide carried by the carriage to be disposed over the plastic concrete along the line ofthe joint, and means movable downwardly into said slot from above the slot for forcing a joint strip down from within the slot through said guide into the concrete.

14.. An apparatus forv producing a joint in a concretev surfacing structure comprising a carriage movable over plastic concrete, a slotted guidecarried by the carriage to be disposed over the plastic concrete along the line of the joint, and a blade movable downwardlyinto said slot from above the slot to form a joint strip from withinsaid guide into the concrete.

15. Apparatus for producing a joint in a concrete surfacingstructure comprising a carriage movableoverthe plastic concrete, a slotted guide to bepositioned above the plastic concrete, means adjustably supporting said guide from the carriage, and means movable into the guide from above the guide for forcing joint material ,d0wnwardly from within the guide, into the plastic concrete. f

16. Apparatus for producing a joint ina con-' crete surfacing structure comprising a slotted guide, a blade movable downwardly through the guideinto the plasticconcrete, and means for vibrating said blade 1'7. Apparatus for producing a joint in a concrete surfacing structure comprising a carriage movable over the plastic concrete, a cutting blade movable along the line ofthe joint, and means for mounting said blade from thecarriagefor sliding and swinging movements in the plane of the joint. I e

i 18. Apparatus'for producing a joint in a concrete surfacing structure icomprisinga carriage, a blade to move along the line of the joint,iand means mounting said blade from the carriage for upward and downward, forward and rearward, and swinging movements in the plane of the joint;

19. Apparatus for producing a joint in'a concrete surfacing structure comprising a ca'rriage,

a cutting blade mounted for sliding and swinging movements from the. carriage, and means for imparting a rotary motion to another portion of theblade. I

20. Apparatus for producing a joint in a'concrete surfacing. structure comprising a carriage, a cutting blade having a sliding andswinging connection with the carriage, and an eccentric mounted on the carriage and engaging said blade for actuating it.

21. Themethod of producing a joint in a concrete surfacing structure consisting in positioning a guide member over theplastic concrete along the line of a joint, guiding joint material downwardly by said guide member to enter the plastic concrete, and guiding means by said guide member to force the joint material downwardly into the plastic concrete.

22. The method of producing a joint in'a concrete surfacing structure consisting in positionins: a. snid me ber; ove th last e e erat a e the line of yi intjeuidine nt strip er lyi bin aidsuid m m er. t en r the 121 .ncre e. an mo in a bl de d w ard whi e euided said uid me herto r e f tn 1d wuwar e de me er in he last c, e r t I I p .23., il em the 'nrod c ne ai nt n a .Qte esur ns struc u e c is i in p t m e a ed ide ve the-p a concre a ne h iaio' t idin joint material d wnw rd y i tl es1 t i e dlau deto enter e plas ic QQCIQFQ an mQvi e'me -n d wn r -he.-slot of the guide from above said slot to he JQ ma e a downwardly from within said slot into the plastic material. V V

2 l .,The.method .OfJQI'OdllCi-HE a joint in a concrete surfacing structure consisting in'positioning a slotted guide over the plastic concrete along the line of a joint, guiding a joint strip downwardly from within the slot of said guide to enter the plastic concrete, and moving a blade downwardly'into said slot from above the slot to force the joint strip downwardly from within the slot into the plastic concrete.

25. The method of producing a joint in a concrete surfacing structure consistingin positioning a guide member over the plastic concrete along the line of the joint, forcing a joint strip into the plastic concrete while guided by said member and leaving the upper edge portion of the strip in overlapping relation with the guide member, and moving the guide member longitudinally to remove it from said strip and position the guide member for the successive strip.

26. The method of producing a joint in a concrete surfacing structure consisting in positioning a slotted guide over the plastic concretealong the line of the joint, forcing a joint strip from within the slot of said guide into the plastic concrete with the upper edge portion of the strip remaining in said slot, and moving the guide 1ongitudinally to remove it from said strip and position the guide for the successive strip.

27. The method of producing a joint in a concrete surfacing structure consisting in positioning a slotted guide over the plastic concrete along the line of the joint, forcing joint material through the slot of the guide into the plastic concrete with the upper portion of said material remaining in said slot, and moving the guide longitudinally from said material to position the guide for the successive material.

28. The method of producing a joint in a concrete surfacing structure consisting in moving a guide member longitudinally of itself over theplastic concrete along the line of a joint, and forcing joint strips into the plastic concrete while guided by said'member,

29. The'method of producing a joint in a concrete surfacing structure consisting in moving a slotted guide longitudinally of itself over the plastic concrete along the line of a joint, and forcing joint strips from within the slot of the guide into the plastic concrete.

30. The method of producing a joint in a concrete surfacing structure consisting in moving a slotted guide longitudinally of itself over the plastic concrete along the line of the joint, and forcing joint material through said slot of the guide downwardly into the plastic concrete.

31. The method of producing a joint in a concrete surfacing structure consisting in moving a guide member longitudinally of itself over the plastic concrete along the line of the joint, cutting the Pla ic on ete aloneths line 9i; and u ded h s id. e ..andt e .ns oint. tri s int he cut made while guided by said member. 1 i

:1T l .m6 d otproducmea join coiirete surfacing structure consisting in ,mQving, a

slotted guide longitudinally of itselfvover the plastic concrete along Itheline'of the jointycutjguide, and forcing joint materialthrough said slot .Qfthe-guide into the crete. 7 vi The method ofproducing a,j,o=int'in acon crete surfacing structure consisting in movingl'a slotted guide longitudinally of-itself ,o-v.er' the plastic-concrete alo-ngthelineof the-joint, cutting the plastic concreteithroughthe slot of said guide, and forcing jo-intistrips from within-theslot ofthe guideintothe cut madeinthe concrete;

34. An apparatus for producing a joint in a concrete surfacing structure comprising an elongated guide member to be positioned over the plastic concrete for guidinga blade or strip moved into and means mounting said guide for movement longitudinally of itself along the line of the joint.

cut made in the plastic con.-

ting the plastic ,concreteithroughthe slot; of the l 36. Apparatus for producing a joint in a concrete surfacing structure comprising a carriage movable over the plastic concrete, a cutting blade,

and means for mounting said blade from the carriage for reciprocation longitudinally of the movement of the carriage and for reciprocating said blade in said direction for producing a longitudinal j oint in the plastic concrete.

37. The method of forming grooves'in plastic concrete, comprising the forcing of a joint memher into the plastic material, said member being supported in an expanded condition by a second member inserted within the first member, removing the second member thereafter and filling the space occupied by the second member with a sealing material.

38. The method of installingjoints in plastic concrete, consisting of forcing a folded joint member into plastic concrete and thereafter removing an expanding member from within the top of the second member, and thereafter app1y ing joint material within the open top of the first named member to seal the joint and produce a traffic line.

39. A joint installing machine comprising a wheeled carriage spanning a road under construction, a single longitudinal aligning member carried by the carriage, a joint cleaving implement having means associated with the member for supporting the implement on the member for movement longitudinally along the member to cleave plastic concrete to receive a joint strip.

40. A joint aligning and installing guide, comprising a single longitudinal member, a joint cleaving implement having portions to engage the guide for movement of the implement along the guide to cleave plastic concrete to receive a joint strip to be aligned by the guide.

41. A semicircular joint cleaving implement carried by a carriage spanning a roadway under construction, said implement having up and down, backward and forward movement, means for exerting pressureon the implement while operating in the plastic material; and means for raising the implement from contact with the concrete. I

42. A road building machine comprising a wheeledcarriage operating 'on side forms and moving; over a roadunder construction with reinforcing-steel imb'edded within said road, an implement carried by the carriage to penetrate into the plastic concrete to a depth substantially as that of the reinforcing, and means for exerting pressure on the implement to depress any reinforcing which contacts with the bottomof implement.

- 43. The method of' producing joints in concrete surfacing structures, consisting of depressing a U-shaped longitudinal joint member down into plastic concrete by an implement to be moved within the channel formed by the U and thereafter removing the implement and material within the channel.

44. The method of producing joints in plastic concrete, consisting of forcing a U-shaped longitudinal joint member down into the plastic concrete by an implement inserted within the U portion and exerting pressure on the implement and withdrawing the implement from the member and applying joint material into the U portion of the member remaining in the concrete.

* 45, The method of constructing joints in conapplying joint crete surfacing structures, consisting of forcing a U-shaped member into the plastic concrete and holding the sides of the member against the plastic concrete by an implement inserted withinthe sides of the member.

' JOHN N. HELTZEL. 

